PARMENTER, M. M.; STEWART, P. N. Normal rings and local ideals. Mathematica Scandinavica, Berkeley, CA, United States, v. 60, p. 5–8, 1987. DOI: 10.7146/math.scand.a-12166. Disponível em: https://journals.msp.org/mscand/article/view/1459. Acesso em: 25 jul. 2026.